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Automobile wiper driving apparatus

a technology of driving apparatus and wiper, which is applied in the direction of motor/generator/converter stopper, dynamo-electric converter control, vehicle cleaning, etc., can solve the problems of motor 101 having a further disadvantage, and affecting the operation of the motor

Inactive Publication Date: 2004-03-25
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an improved automobile wiper driving apparatus that overcomes the disadvantages of the conventional apparatus. The technical effects of the invention include reducing the size of the motor and the complexity of the wiper driving apparatus, simplifying the operation of the apparatus, and improving the speed control of the wiper.

Problems solved by technology

However, the conventional motor 101 has a disadvantage that it becomes large-scaled, because three brushes are required and moreover a total number of coil windings is increased to some degree in order that the wiper speed difference is achieved by a winding number difference.
Further, it has another disadvantage that a part of the windings becomes of no use under the HIGH speed mode, because The HIGH speed mode requires less windings than the LOW speed mode does.
Further, the conventional motor 101 has a still another disadvantage that such driving devices as transistor 104 & relay 105 and the MOSFET 106 & charge pump 106a are required for the HIGH and LOW speed mode, respectively and independently.
Further, it has other disadvantage that the transistor 108 & relay 109 is required for electrically opening the LOW brush 101b when the HIGH speed mode is turned on.
Thus, the ECU 102 becomes complicated and large-scaled.
However, this is not advantageous.
For example, the actual wiper speed becomes decreased, when the windshield becomes dirty together with mud and rainfall, thereby increasing the wiper load.
However, the wiper descending speed may possibly be over-compensated, if the duty during the wiper descent is simply increased.

Method used

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  • Automobile wiper driving apparatus
  • Automobile wiper driving apparatus

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0062] Embodiment 1

[0063] FIG. 1 is a conceptual view of the wiper driving apparatus of Embodiment 1 of the present invention.

[0064] The wiper driving apparatus as shown in FIG. 1 is mounted on an automobile vehicle and used for wiping the outer surface of the front windshield. The wiper driving apparatus as shown in FIG. 1 comprises: a pair of wipers 1 and 2 for wiping the outer surface of the front windshield; a wiper driving module 10 for driving the wipers 1 and 2; and a link mechanism 5 for transmitting to the pair of wipers 1 and 2 a driving force of the wiper driving module 10.

[0065] In the wiper driving apparatus of Embodiment 1, like conventional wiper apparatuses, the HIGH speed mode or LOW speed mode can be set up by driver's operating the COMBI-SW 14a (cf. FIG. 3) near the driver's seat. The intermittent mode operating under LOW speed mode can be also set up by the COMBI-SW 14a. Further, there can be provided an automatic mode wherein the wipers 1 and 2 is automatically ...

embodiment 2

[0112] Embodiment 2

[0113] FIG. 6 is a circuit diagram of the wiper driving apparatus of Embodiment 2 which differs in that: the p-channel power MOSFET 22 (the braking device in Embodiment 1) is a switching device connected with the motor 12 (anode side of the battery 17); the n-channel power MOSFET 21 (the switching device in Embodiment 1) is a braking device; further, there is provided on the current route from the p-channel MOSFET 22 to the motor 12 a current detection unit 45 for detecting an electric current through the motor 12.

[0114] The differences between Embodiments 1 and 2 are mainly explained below, although similar points are not explained. Similar elements are designated by similar reference numerals.

[0115] In Embodiment 2 as shown in FIG. 6, the brush 12b of the motor 12 is connected with the ground, while the brush 12 a is connected through the current detection unit 45 and p-channel MOSFET 22 with the anode of the battery 17.

[0116] The communication micro-computer 24...

embodiment 3

[0131] Embodiment 3

[0132] FIG. 8 is a circuit diagram of the wiper driving apparatus of Embodiment 3 which is different from those of Embodiments 1 and 2. The wiper driving apparatus of Embodiment 3 employs a communication micro-computer 61 (included in the body ECU 16) outside the wiper ECU 11. The communication micro-computer 61 determines the motor operation mode, decides the PWM signal duty for the motor 12, while a micro-computer 55 (without communication function) on side the wiper ECU 11 drives the motor 12 in accordance with the instruction outputted from the communication micro-computer 61.

[0133] Although the wiper ECU 11 of Embodiment 3 is constructed similarly to that of Embodiment 1, a low cost micro-computer 55 which can not execute data communication through the multiple communication line L1 is used in Embodiment 3, in place of the communication micro-computer 24 in Embodiments 1 and 2.

[0134] One of the input ports of the micro-computer 55 is connected with the power ...

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Abstract

The wiper driving apparatus module includes: a motor 12 for driving a wiper unit; a wiper ECU 11 for driving the motor 12; a deceleration mechanism (including gears). The two brush DC motor is employed and driven by a pulse width modulation (PWM) signal, in place of the conventional three brush motor wherein brushes are changed in accordance with a wiper operation speed. Therefore, the number of windings is only a number required for a high speed operation of the wiper unit. The high speed operation is implemented by 100% duty PWM signal, while the low speed operation is implemented by reducing the duty. The PWM signal duty is changed in response to a rainfall, windshield surface state and wind pressure which cause the wiping speed fluctuation.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to an automobile wiper driving apparatus for driving a wiper on a windshield of an automobile vehicle.[0003] 2. Description of the Related Art[0004] A conventional wiper driving apparatus 100 as shown in FIG. 10 comprises: a motor 101 for driving a not-shown wiper unit; a wiper electronic control unit (ECU) 102 (provided separately from the motor 101) for driving the motor 101; a combination switch (COMBI-SW) 103 for selecting a low & high speed modes and intermittent mode; and another switch (HIGH-SW 14h) 103a which is turned on when the high (HIGH) speed mode is selected by the COMBI-SW 103.[0005] Further, the coils of the motor 101 are in contact with three brushes: a HIGH brush 101a connected with a contact of a relay 105a for switching on the HIGH speed mode; a LOW brush 101b connected through a contact 109a of a relay 109 with a MOSFET (n-channel power MOSFET) 106 for switching on the LOW speed mode; and a co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60S1/08
CPCH02P7/2906B60S1/08H02P7/291
Inventor TAKAGI, NOBUTOMO
Owner DENSO CORP